Bitwise operators

[terraego]

Hey, this is my first post!

i was reading through some mangos source code and i'm really interested in how this emulator works. im quite new to c++ but i cant help but notice that people dont use bitwise operators. like so:

if (a&b) 
   {
    action
   }

instead of

if (a&&b) 
   {
    action
   }

now bitwise operators are faster. if 'a' is false it automaticly stops processing and return 0, it doesnt check the other variable. so i was interested and did some tests. this is what came out:

**********************************
bitwise [00]: 2235 nanoseconds result: false  
bitwise [10]: 1676 nanoseconds result: false  
bitwise [01]: 2235 nanoseconds result: false  
bitwise [11]: 1676 nanoseconds result: true  
**********************************
non bitwise [00]: 2793 nanoseconds result: false  
non bitwise [10]: 1955 nanoseconds result: false  
non bitwise [01]: 1955 nanoseconds result: false  
non bitwise [11]: 1677 nanoseconds result: true  
**********************************

as you can see, using bitwise operators is at least 10% faster then not using bitwise operators. for the testing i used:

        if (a && b) {
           result = true;
       } else {
           result = false;
       }

the using of bitwise operators seems faster when using while, will this help you guys in any way?

[VladimirMangos]

Totally wrong.

1) in if(a && b) only _a_ calculated if it have false result and _b_ not executed and save time for program work

in if(a & b) _both a and b calculated that can be lot more slow

2) in C/C++ any non-0 values is true values and then f(4 && 2) is laways true

BUT if(4 & 2) is always false.

[terraego]

ah okay! i always programmed in java and just recently started c/c++ it works a bit different in java so i thought maybe it would be faster in c/c++ too